Fluid pressure brake



June 20, 1939. E, osuN HAL 2,163,034

FLUID PRESSURE BRAKE Filed Aug. 2, 1957 3 Sheets-Sheet 1 un 20, 1939 E. p. GOSLING Er AL 2,163,034

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E. P. GOSLING ET AL FLUID PRESSURE BRAKE Filed Aug. 2, 1937 3 Sheets-Sheet 3 Patented June 20, 1939 UNITED STATES PATENT OFFICE FLUID PRESSURE BRAKE Edward P. Gosling and" Ferdinand J. Bittermann,

St. Louis Application August 2, 1937, Serial No. 156,854

5 Claims.

Our invention relates to fluid pressure brakes, and has for its principal object a fluid pressure brake of the disk type, wherein the pressure is evenly applied, wherein any desired pressure may be obtained which automatically compensates for wear and which is simple and compact in con-- struction. Other objects and advantages will appear hereinafter.

The invention consists principally in the fluid pressure brake and in the parts and combinations and arrangements of parts hereinafter described and claimed. In the accompanying drawings, Fig. l is a part elevation, part longitudinal sectional view of a brake construction embodying our invention,

Fig. 4.

In Figs. :1 to 3 is illustrated a single disk brake construction for an automobile wheel. On the end of the axle shaft I is mounted the usual wheel seat 2 having a radial flange 3 against one side of which the wheel (not shown in the drawings) abuts and against the other side of which mounted the central disk portion 4 of a brake drum 5. Suitable studs 6 are provided for holding the brake drum 5 and the wheel in position. Surrounding the body of theaxle shaft I is the usual axle housing 'I on the end portion of which is mounted a tubular supporting casing 8 for the brake actuating mechanism. Said casing 8 projects beyond the end of the axle housing 1 and antifriction bearings 9 are interposed between the shaft I and said casing 6. A bearing retaining ring III is secured to the end of the casing 8 as by screws II.

The supporting casing 6 has a radially disposed plate I2 integral therewith, hereinafter designated as the thrust plate. One face I3 of said thrust plate is parallel to and spaced some distance from the radial inner face I4 of the brake drum 5, said radial brake drum f'ace constituting a brake disk. I

Secured to the thrust plate I2, is an annular bellows member, indicated generally by I5. Said bellows member I6 includes'an outer corrugated line z 2 in wall I6 having outwardly disposed radial end flanges I1 and an inner corrugated wall member I6 having inwardly disposed radial end flanges Ill. The flanges ll, I9 at one end of the annular bellows member I5 are secured to said thrust 5 plate I2 as by rings 20 extending around the pe ripheral portions of said end flanges and held in position by means of cap screws 2| extending through holes 22 in the thrust plate and in said end flanges into threaded holes 23 in said rings 10 20. The other end of the annular bellows member I5 is secured by similar rings 20 and screws 2| to a radially disposed ring 24, hereinafter designated as the pressure plate. Expansion of the bellows I5 moves said pressure plate 24 toward the brake disk l4.

The brake supporting casing 8 has splines .25 on its end portion and a hub 26 has internal splines 21 by means of which it is slidably but non-rotatably mounted on said supporting casing 20 8. Springs 26 secured to the thrust plate l2 and to the hub member 26 urge the hub member towards the thrust plate, that is, pull the hub member 26 away from the brake disk I4.

. Secured to the hub member as is a disk 29 as (hereinafter designated as a friction plate) whose outer peripheral portion is held in flatwise contact with the pressure plate 24 by the action of the springs 26. On the face of said disk adjacent to the brake disk I4 0: the drum is a facing an of :0

suitable friction material.

Said thrust plate I2 is provided with a projecting hollow boss 3| whose bore 32 communicates with the interior of the bellows I5 and which is connected with a fluid pressure line 33. The ad- 35 mission of fluid under pressureexpands the bellows I5 and moves'thepressure plate 24 and the hub member 26 with its associated parts toward the brake disk face of the brake drum, causing the friction material III to engage the brake disk 40 I4. Upon release of the fluid pressure, the springs 28 disengage the braking surfaces.

In Figs. 4 to 6 is illustrated a double brake disk construction. The axle shaft Ia has a wheel seat 2a secured to the end thereof and a brake drum 46 5a projects from said wheel seat, said drum having an integral brake disk portion Ma and a cylindrical housing portion II. The two-piece supporting casing, indicated generally as M, comprises a tubular member 6| mounted on the axle 50 housing Ia, said tubular member 6| projecting beyond the end of the axlehousing Ia, and a sleeve 52 mounted on the tubular member II with one end abutting against an integral flange or shoulder 63 provided therefor on the tubular way 63 through said sleeve units. The brake operates on a very pressure.

member Said flange 53 and the end of said sleeve 52 are provided with openings 54 to receive suitable securing screws 55. Interposed between the projecting portion of said tubular support II and the axle shaft la is a suitable bearing 8a which is held in position by means of a retaining ring Ila secured to the end of the tubular support 5| as by screws Ila.

Secured to the open end of the housing portion 50 of the brake drum in, as by screws 56, is a cover disk 51 having a radial inside face 58 constituting a brake disk. Projecting from the sleeve 52 centrally of the brake drum is the double thrust plate l2a, on each face of which is mounted an annular bellows member lid for operating the brake. Said bellows members l5a are similar to those hereinbefore described and each has one end secured to a pressure plate 24a.

The sleeve member 52 has splines 250 on either side of the thrust plate He and internally splined hub members 26:; are mounted thereon, said hub members 260 being urged towards each other and away from the brake disks a and 58 by means of springs 28a secured to the hub members 26a and passing through openings 59 provided therefor in said thrust plate Ila. Said hub members "a have disks 29a secured thereto to which are secured suitable friction facings 30a.

The tubular supporting member is provided with a longitudinal web 60 in which is a passageway 6| that opens through said annular rib 53 and is connected with a supply line 62 through which fluid under pressure is furnished. Said passageway 6| opens into an'an ular passage 63 in the end face of 'said sleeve member 52 abutting against said flange 53. I Longitudinal passageways 64 extend from said annular passage- 52, each longitudinal passageway 6| communicating with a radial passageway $5 in the thrust plate l2a. Each radial eway 65 terminates in a transverse passageway 66, the ends of which open into the respective bellows members I541. The admission of fluid under pressure through the system of passageways into the two both sets of braking members.

The above described brake construction provides an enclosed'brake thereby protecting the braking surfaces from dirt and foreign matter and the system is leak proof, even without the packings required in prior fluid brakes.' The brake, whether single or double, is easily applied, it is self-energizing and disengagement is quick and uniform over the Wear of the braking surfaces is automatically compensated for by increasing the fluid pressure and the degree of expansion of the bellows. The brake is self-adjusting and equal pressure is provided over all brakin surfaces at all times. An unusually large area of braking surfaces is provided, which area may be easily increased by increasing the disk sizes or by adding more braking low pedal Toggles, pins and other mechanical parts required in prior fluid brakes are dispensed with, as are the pistons, packings, adjusting devices and other necessary parts of prior fluid brakes. The elimination of the toggles insures against locking of the wheels and elimination of other parts minimizes mechanical noises. The construction lends itself to varied typesof friction material. Thus a low co-eflicient friction material may be used, giving smooth and positive (1 maintaining a low temperature over the contacting surfaces. A combinabellows members operates whole braking surface.

tion of high co-eflicient and low co-eflicient materials may be used, giving a fast and powerful braking action and fast deceleration without shock or sway. Adequate braking surface is provided to permit the use of all high co-eflicient 5 friction material, making it possible to concentrate the entire braking system, of an automobile for example, in one brake, as on the drive shaft of an automobile.

Obviously, numerous changes may be made withoutdeparting from the invention and we do not wish to be limited to the precise constructions shown.

What we claim is:

l. A fluid pressure brake comprising an axle having a brake drum mounted near the end thereof, said brake drum having a radial brake disk portion, a housing for said axle stopping short of said brake drum, a supportingcasing mounted on said beyond the end thereof, a bearing interposed between said axle and said casing, a positioning ring securing said bearing in said casing, a radially disposed thrust plate projecting from said casing and spaced from said brake disk, said ca's-,

ing having splines on the end nearer said brake disk, an internally splined hub member mounted .on said splined portion, a friction plate secured to said hub member for cooperation with said brake disk, a pressure plate disposed flatwise said friction plate remote from said brake disk, an annular bellows secured to said thrust plate and said pressure plate for forcing said friction plate towards said brake disk against the face of and means for supplying fluid under pressure to 5 said bellows.

2. A fluid pressure brake comprising an axle having a brake drum mounted near the end thereof, said brake drum having a radial brake disk portion, a housing short of said brake drum, a supporting casing mounted on said axle housing and projecting beyond the end thereof, a bearing interposed be tween said axle and said casing, a positioning ring securing said said hub member, a radially disposed thrust plate projecting from said casing and spaced from said brake disk, said casing having splines on the end nearer said brake member mounted on'said splined portion, a friction plate secured to said hub member for cooperation with said brake disk, a pressure plate flatwise against the face of said friction plate remote from said brake disk, an annu- 55 lar bellows secured to said thrust plate and said pressure plate for forcing said friction plate towards said brake fluid under pressure to said bellows.

3. A fluid pressure brake rotatable brake disks, a stationary plate intermediate therebetwee ,splined members projecting centrally from both faces of said thrust plate, hub members slidably splined on said splined members, a friction plate secured to each 65 axle housing and projecting 20 for said axle stopping bearing in said casing. the

outer peripheral portion of said ring overlapping disk, an internally splined hub v disk and means for supplying comprising spaced of said pressure plates brake comprisin an 8116 76 having a brake drum mounted near the end thereof, said brake drum having an internal radial brake disk portion and a cylindrical housing portion, a cover plate secured to said housing, its inner radial face also constituting a brake disk, an axle housing projecting through said,

cover plate, a sleeve mounted on the end of said axle housing and extending to a point near the central portion of said brake drum, said sleeve having a flange, a tubular member mounted on said sleeve against said flange, a thrust plate extending radially from said tubular member intermediate between said brake disks, hub members slidably but non-rotatably mounted on aid tubular member on either side of said thrust plate, a friction plate secured to each hub member for cooperation with a brake disk, a pressure plate disposed flatwise against each friction plate, annular bellows members each secured to one face of said thrust plate and to one of said friction plates, springs urging said hub members together to disengage the braking members and means for supplying fluid under pressure to said bellows for engaging the braking members.

5. A fluid pressure brake comprising an axle having a brake drum mounted near the end thereof, said brake drum having an internal radial brake disk portion and a cylindrical housing portion, a cover plate secured to said housing,

its irmer radial face also constituting a brake disk, an axle housing projecting through said cover plate, a sleeve mounted on the end of said axle housing and extending to a point near the central portion of said brake drum, said'sleeve having a flange, a tubular member mounted on said sleeve against said flange, a thrust plate extending radially from said tubular member intermediate between said brake disks, hub members slidably but non-rotatably mounted on said tubular member on either side of said thrust plate, a friction plate secured to each hub member for cooperation with a brake disk, a pressure plate disposed fiatwise against each friction plate, annular bellows members each secured to one face of said thrust plate and to one of said friction plates, springs urging said hub members together to disengage the braking members and means for supplying fluid under pressure to said bellows for engaging the braking members, including an annular groove in the end of said tubular member against said flange, longitudinal passageways extending through said tubular member to said thrust plate, radial passageways in said thrust plate and transverse passageways in said thrust I plate. 4

EDWARD P. GOSLING. FERDINAND J. BITTERMANN. 

